CLAS Physics Database

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Measurement E151M49

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Experiment: EG4, 2016

Spokespersons: Xiaochao Zheng

Experiment comment: Final asymmetry results for the ep-> e pi+ (n) channel extracted from CLAS/EG4 data obtained using a longitudinally polarized beam and a longitudinally polarized NH3 target (CAA HS07-02).

No publications available for this experiment

Quantity measured: A_UL,
Target spin asymmetry.
Beam: e, polarization: longitudinal
Target: p (Z=1, A=1), polarization: longitudinal
Final state: π⁺n, polarization: none

Q² :	0.0291 GeV²
W :	1265 GeV
ε :	0.8787
E_beam :	1.0539 GeV
ε_L:	0.1608

Select data slice:
cos(θ_π⁺) =

Observable quantity measured (Y axis): A_UL,
Plot measurement data

Parameter (X axis): φ(π⁺), degrees

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Measured data:

cos(θ_π⁺)	φ(π⁺), degrees	A_UL	Data errors	Systematic errors
0.15	42	0.5418	0.5791	0.0686
0.25	30	-0.0515	0.6743	0.0306
0.25	42	0.9864	0.553	0.1162
0.25	54	0.9822	0.649	0.1157
0.35	30	-0.6307	0.4386	0.0778
0.35	42	0.4254	0.4645	0.0569
0.35	54	0.6438	0.5213	0.0792
0.45	30	1.0803	0.5973	0.1265
0.45	42	-0.7111	0.3707	0.0863
0.45	54	0.5357	0.5297	0.0679
0.45	270	-0.3931	0.4624	0.0539
0.45	282	-0.5175	0.5906	0.0661
0.55	54	-0.2706	0.6649	0.043
0.55	234	-0.1899	0.6249	0.037
0.55	246	0.3412	0.3929	0.0491
0.55	258	0.1913	0.3303	0.0371
0.55	270	-0.4796	0.2996	0.0623
0.55	282	0.1858	0.3951	0.0367
0.65	150	0.9322	0.6774	0.1102
0.65	162	0.7157	0.7021	0.0868
0.65	234	-0.0247	0.4511	0.0301
0.65	246	0.0765	0.3509	0.0312
0.65	258	-0.0401	0.2727	0.0303
0.65	270	0.2584	0.3242	0.042
0.65	282	-0.1783	0.4053	0.0362
0.75	138	-0.0454	0.6415	0.0304
0.75	150	0.4566	0.4552	0.06
0.75	162	0.4758	0.4349	0.0619
0.75	174	-0.5602	0.3857	0.0704
0.75	186	0.0001	0.4241	0.03
0.75	198	0.1714	0.5537	0.0358
0.75	210	-0.2669	0.5488	0.0427
0.75	222	-0.3076	0.5056	0.0461
0.75	234	-0.1242	0.3683	0.0332
0.75	246	-0.4389	0.2884	0.0583
0.75	258	0.3004	0.268	0.0455
0.75	270	-0.1498	0.2969	0.0345
0.75	282	-1.0111	0.2847	0.1189
0.85	126	0.8867	0.6477	0.1053
0.85	138	-0.0492	0.4245	0.0305
0.85	150	-0.2702	0.344	0.043
0.85	162	0	0.3354	0.03
0.85	174	1.5708	0.4358	0.1812
0.85	186	0.3753	0.4954	0.0522
0.85	198	0.3338	0.5539	0.0484
0.85	210	0.3714	0.5138	0.0518
0.85	222	-0.5456	0.5359	0.0689
0.85	234	-0.4597	0.3923	0.0603
0.85	246	-0.0624	0.352	0.0308
0.85	258	0.2948	0.3027	0.045
0.85	270	-0.3698	0.3075	0.0517
0.95	138	-0.6476	0.4492	0.0796
0.95	186	0.9287	0.5094	0.1098